Sombut V, Ohama P, Kumpun S, Kulnides N, Yingyongnarongkul B- ek. Separation of Blue Ballpoint Pen Inks- A Comparison of Solvent Systems on Thin Layer Chromatography Techniques. Suan Sunandha Sci & Tech [Internet]. 2022 Dec. 5 [cited 2024 May 3];5(1):20-7. Available from: https://li02.tci-thaijo.org/index.php/ssstj/article/view/331